CN206736884U - T-shaped feeler inspection square-section probe - Google Patents
T-shaped feeler inspection square-section probe Download PDFInfo
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- CN206736884U CN206736884U CN201720472841.1U CN201720472841U CN206736884U CN 206736884 U CN206736884 U CN 206736884U CN 201720472841 U CN201720472841 U CN 201720472841U CN 206736884 U CN206736884 U CN 206736884U
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Abstract
The T-shaped feeler inspection square-section probe of the utility model is cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is rectangle.Cross bar is with Double lumen intubation probe using cone slot type attachment structure or screw thread type attachment structure.In side view, rectangle a length of 2a, a height of 2b, 0<b/a<1.The probe of the T-shaped feeler inspection of the utility model is changed to square-section, can significantly reduce detecting head surface roughness difference and the uncertain test error brought.Processing and fabricating of popping one's head in is convenient, can greatly promote application of this method in engineering practice.
Description
Technical field
The utility model relates to T-shaped feeler inspection sonde configuration.
Background technology
T-shaped feeler inspection is also full stream feeler inspection, is a kind of method for the undrained shear strength for testing soft clay.Soft clay is not
Draining shearing strength is to determine the important indicator of foundation bearing capacity, bearing capacity of pile foundation and Critical Height of Embankment, is soft clay foundation
Parameter necessary to Foundation Pit Support Design.
The method of testing of the index mainly has laboratory experiment method and the class of in-situ test method two.During laboratory test sample by
Power condition is clear and definite, but in sampling and sample making course, sample is disturbed big, and result of the test dispersion is big, representative poor.In-situ test
In method, field vane shear test is method the most frequently used at present, but the drainage condition of the soil body can not control in test process, test effect
Rate is low, can only obtain the undrained shear strength along each discrete point of depth, and measuring point spacing is generally 1m.In home position testing method,
Cone penetration test rule of thumb relation, tries to achieve soft clay undrained shear strength indirectly.Upper earthing is included in this empirical relation
The contents such as pressure correction, the empirical coefficient related to soil nature and area.The value of these empirical coefficients will all influence test result
Accuracy.
The T-shaped feeler inspection probe of in-situ test tradition is cylinder, and test result interpretation has strict theoretical foundation, testing efficiency
Height, the continuous undrained shear strength value along depth can be obtained, but test result is had a great influence by detecting head surface roughness, it is right
Ying Yu is completely smooth and complete coarse two kinds of limiting conditions, and test result difference and average ratio are up to 26%.In Practical Project, added
Work and the influence of scene abrasion, it is difficult to control the roughness of probe, limit the application of the test method to a certain extent.Cause
A kind of Novel T-shaped feeler inspection probe for reducing probe roughness and influenceing is needed in this engineering practice.
The cone penetrometer popped one's head in using other shapes, it is always that engineering and academia make great efforts research to reduce systematic error
Direction.Probe is the core component of cone penetrometer, the corresponding different data interpretation mode of probe of different shapes, forms different touch
Visit instrument.The interpretation theoretical foundation of the T-shaped feeler inspection of cylinder proposes for the Randolph and Oxonian Houlsby of Cambridge University
Analytic expression [1].The analytic expression tries to achieve the theory analysis for being related to complexity.
[1]M.F.RANDOLPH,G.T.HOULSBY The limiting pressure on a circular pile
loaded laterally in cohesive soil[J].Géotechnique,1984,34(4):613–623.
Utility model content
The technical problem that the utility model solves is, the shortcomings that probe for the T-shaped feeler inspection of existing circular cross-section, proposes
A kind of new probe, so as to improve measuring accuracy and reliability.
To achieve the above object, the utility model adopts the following technical scheme that：A kind of T-shaped feeler inspection square-section probe, should
Square-section probe is cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is rectangle.
Cross bar is provided with the circle that drift angle is 60 ° with Double lumen intubation probe using cone slot type attachment structure, cross bar middle part
Taper storage tank, Double lumen intubation probe is with montant and the top cap being connected with montant bottom, top cap and the storage tank phase
Suit.
Cross bar uses screw thread type attachment structure with Double lumen intubation probe, is provided with screw thread in the middle part of cross bar, screw thread passes through
Joint is connected with cross bar, and Double lumen intubation probe only has montant, montant bottom and screw thread bolt.
In side view, rectangle a length of 2a, a height of 2b, 0<b/a<1.
The beneficial effects of the utility model are as follows.The utility model has tried to achieve square-section by substantial amounts of research work
Pop one's head in resistance approximate solution, analyze systematic error with rectangle axial length than change, have found optimal axial length than section, obtain
Calculating parameter needed for the probe work of square-section.The probe of T-shaped feeler inspection is changed to square-section, can significantly reduce detecting head surface
Roughness difference and the uncertain test error brought.Processing and fabricating of popping one's head in is convenient, can greatly promote this method in engineering
Application in practice.
Brief description of the drawings
Fig. 1 is utility model works structural representation.
Fig. 2 a are the utility model embodiment cross bar front view.
Fig. 2 b are Fig. 2 a side view.
Fig. 2 c are Fig. 2 a top view.
Fig. 3 a are another embodiment cross bar front view of the utility model.
Fig. 3 b are Fig. 3 a side view.
Fig. 3 c are Fig. 3 a top view.
Fig. 4 is the utility model embodiment cross bar and Double lumen intubation probe attachment structure schematic diagram.
Fig. 5 is another embodiment cross bar of the utility model and Double lumen intubation probe attachment structure schematic diagram.
Fig. 6 is computation model simplification figure.
Fig. 7 is drag-coefficient curve.
Fig. 8 is the ratio between resistance coefficient difference and average value curve.
Fig. 9 be resistance coefficient average value with axial length than change.
Embodiment
As shown in figure 1, the utility model is a kind of T-shaped feeler inspection square-section probe, square-section probe is cross bar 1,
Cross bar 1 is connected with Double lumen intubation probe 2, the hollow feeler lever 21 of top connection of Double lumen intubation probe 2, in hollow feeler lever
Portion is provided with probe sensor transmission line 22, is connected by probe sensor transmission line 22 with display device 23, display device
23 are used to show probe reading.It focuses on, and as shown in Fig. 2 a-c and Fig. 3 a-c, the side view of the cross bar 1 is rectangle.
In Fig. 2 a-c and Fig. 4, cross bar 1 is with Double lumen intubation probe 2 using cone slot type attachment structure, the middle part of cross bar 1
The conical storage tank 3 that drift angle A is 60 ° is provided with, Double lumen intubation probe 2 has montant 4 and is connected with the bottom of montant 4
Top cap 5, top cap cone angle and storage tank drift angle match, and 60 °, and top cap 5 just mutually suits closely with the storage tank 3.This
Behind the probe press-in underground of the kind structure square-section, underground is left in, it is impossible to be brought up, be disposable.
In Fig. 3 a-c and Fig. 5, cross bar 1 uses screw thread type attachment structure, the middle part of cross bar 1 with Double lumen intubation probe 2
Screw thread 6 is provided with, screw thread 6 is connected by joint 7 with cross bar 1, the only montant 4 of Double lumen intubation probe 2, the bottom of montant 4
With the bolt of screw thread 6.Such a structure can be recycled.
The utility model has tried to achieve the approximate solution of square-section probe resistance by substantial amounts of research work, analyzes and is
Error of uniting with rectangle axial length than change, have found optimal axial length than section, obtained needed for the probe work of square-section
Calculating parameter.
The probe of the T-shaped feeler inspection of tradition is changed to square-section by the utility model, and it is poor can significantly to reduce detecting head surface roughness
The different and uncertain test error brought.Processing and fabricating of popping one's head in is convenient, can greatly promote this method in engineering practice
Using.
The utility model probe is the cross bar of rectangular cross-section.Cross bar can pass through two kinds with general static penetrometer main frame
Mode connects.
(1) slot type is bored.The conical storage tank that one drift angle is 60 ° is set in the middle part of the cross bar side of square-section.It is double during test
Vertically probe mutually suits bridge static contact-detection machine with this probe storage tank.
(2) screw thread type.The thread being connected with static contact-detection machine probe end is set in the middle part of the cross bar side of square-section.
Double lumen intubation probe top cap is taken, this thread is connected with static sounding probe end.
During test, this probe is flatly pressed into underground using static contact-detection machine.In process of press in, bored by static sounding
Sharp resistance, obtain pushing the power needed for the probe of square-section, be designated as the resistance P that pops one's head in.The general record per descending 10cm is once.
For soft clay, its undrained strength characteristic obeys Tresca yield conditions.Probe resistance P and soft clay not draining
Shearing strength Su, probe length L, probe section rectangle it is long relevant with high (a and b) and surface roughness α.According to native plasticity
Mechanics slip line field theory, horizontal sheet and vertical lamella probe resistance P are asked, there are two methods, one kind is by constructing static(al)
The stress field allowed, try to achieve resistance lower limit solution P-, a kind of is by constructing the motor-driven velocity of displacement field allowed, trying to achieve Upper Bound Solution P+。
If Upper Bound Solution P+With lower limit solution P-Identical, then gained solution is accurate solution P.
As shown in fig. 6, rectangular probe is resolved into vertical thin slice of the height as probe height by the utility model, and
Horizontal sheet two parts consistent with probe width.It is assumed that resistance (P caused by this two parts1And P2) sum and rectangular probe institute
Formula (1) is obtained by resistance P etc.：
P=P1+P2 (1)
For complete coarse (α=1) and (α=0) two kinds of limiting conditions are completely smooth, resistance coefficient resistance coefficient (Dimensionless) with square-section axial length be shown in Table 1 than ξ (ξ=b/a) relation.
The probe resistance coefficient of table 1 N
Will be completely coarse and be completely smooth under two kinds of working conditions, resistance coefficient (NCAnd NS) with axial length than change see figure
7.As can be seen from Figure 6, as axial length is than ξ) reduction, the difference of two kinds of operating mode resistance coefficients is gradually reduced.
It is completely smooth and complete coarse two kinds of operating mode resistance coefficient differences and resistance coefficient average value
The ratio between with axial length than change see Fig. 8.
As can be seen from Figure 8, square-section probe the ratio between resistance coefficient difference and average value, with axial length than increase, it is more next
It is bigger, systematic error increase.When axial length is less than 1 than b/a, measuring accuracy is popped one's head in better than the spy of typical round section in square-section
Head.Therefore, in side view, rectangle a length of 2a, a height of 2b, 0<b/a<1.
When axial length is than ξ=0, i.e., when probe be a horizontal positioned no thickness piece, difference 0, test result is with popping one's head in
The roughness on surface is unrelated, and systematic error is minimum.But limited by the strength of materials, it is impossible to using the probe of ξ=0, but select
Select a suitable ξ value (0<ξ<1), probe is made to be tested.
Pop one's head in resistance P and probe length L, the axial length of square-section half (a and b), Soft Clay Foundation undrained shear strength Su,
There is relational expression (2) as follows：
The undrained shear strength of soft clay is directly tried to achieve using above formula.
Fig. 1 is probe operating diagram.Applied in work using static contact-detection machine and push load F, square-section is visited
Head is flatly pressed into underground.During pushing, by popping one's head in, pressure sensor surveys read tap cone resistance.The value is square-section
Ground soil resistance suffered by probe divided by the numerical value after static sounding probe top cap cross-sectional area, unit MPa.Therefore probe is read
Number is multiplied by the cross-sectional area, produces square-section probe suffered resistance P during pushing.
During practical application, probe resistance P and probe length L, square-section half axial length a and b of probe, Soft Clay Foundation are not arranged
Water shearing strength Su, can be expressed by following relational expression (3).
In formula,For resistance coefficient average value, more relevant than b/a, detecting head surface roughness with axial length, specific value is shown in Fig. 9
Or table 2.
The resistance coefficient average value of table 2
Soft clay undrained shear strength S can be obtained according to relational expression (3)uRelational expression (4)：
In test process, a reading is typically surveyed per 10cm along depth, test speed 1.2m/min, is calculated by relational expression (4)
Obtain undrained shear strength Su, draw along depth change curve.
Claims (4)
1. a kind of T-shaped feeler inspection square-section probe, square-section probe are cross bar, cross bar is connected with Double lumen intubation probe
Connect, it is characterised in that the side view of the cross bar is rectangle.
2. T-shaped feeler inspection square-section probe as claimed in claim 1, it is characterised in that cross bar is popped one's head in Double lumen intubation
Using cone slot type attachment structure, the conical storage tank that drift angle is 60 ° is provided with the middle part of cross bar, Double lumen intubation probe has
Montant and the top cap being connected with montant bottom, top cap mutually suit with the storage tank.
3. T-shaped feeler inspection square-section probe as claimed in claim 1, it is characterised in that cross bar is popped one's head in Double lumen intubation
Using screw thread type attachment structure, screw thread is provided with the middle part of cross bar, screw thread is connected by joint with cross bar, and Double lumen intubation is visited
Head only has montant, montant bottom and screw thread bolt.
4. T-shaped feeler inspection square-section probe as claimed in claim 1, it is characterised in that in side view, a length of 2a of rectangle is high
For 2b, 0<b/a<1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720472841.1U CN206736884U (en) | 2017-04-28 | 2017-04-28 | T-shaped feeler inspection square-section probe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
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- 2017-04-28 CN CN201720472841.1U patent/CN206736884U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
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